Question

I have a query like so:

 Dim clcexists = (From p In dbContext.Signatures _
                          Where p.StudentID = people_id _
                         And p.ContractType = "clc" _
                          Order By p.ID Descending _
                           Select p)

Later I check whether any rows exist in clcexists using IsNothing like so:

   If IsNothing(clcexists) Then ' If no CLC is on file.
            clcfirst = Date.Now.Subtract(year)
            clcdate = clcfirst
        Else ' If CLC is on file.
            clcfirst = clcexists.FirstOrDefault()
            clcdate = clcfirst.SignatureDate
        End If

But IsNothing() is not functioning like I expect. There is no row in the results table, but it is still acting as if there is and going to the Else clause. Help?

Answer 1

You might want to use Any instead:

If Not clcexists.Any() Then ' no CLC is on file.
    clcfirst = Date.Now.Subtract(year)
    clcdate = clcfirst
Else ' If CLC is on file.
    clcfirst = clcexists.FirstOrDefault()
    clcdate = clcfirst.SignatureDate
End If